Pneumatic cleaning installation



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United States Patent 3,317,947 PNEUMATIC CLEANING INSTALLATION ErnstJacobi and Heinz Beck, both of Derchingerstr. 43, Augsburg, GermanyFiled Nov. 9, 1964, Ser. No. 409,692 Claims priority, applicationGermany, Nov. 12, 1963,

J 24,732 30 Claims. (Cl. 15312) The invention concerns a pneumaticcleaning installation employing a carriage adapted to travel above atextile machine and having blowing and suction members dependenttherefrom. Known travelling pneumatic installations of this type usuallyemploy a carriage which can travel over a textile machine or linethereof under the action of driving means, for example, an electricmotor, incorporated on the carriage, the same or different driving meansserving for the drive of a fan or fans for the production of the suctionand blowing air currents, filter means and a storage chamber forcollected dust, fly, lint or the like also being mounted on thecarriage. struction, primarily because its Working parts must bedisposed in close relationship. Furthermore, such a carriage hasintricate inner .air channels and is consequently expensive and isliable to breakdown and thus requires considerabl maintenance. Inaddition, not only rail tracks for the carriage, but also cables orbusbars for feeding the electric motors on the carriage have to bepresent which further increases the complexity and cast of theinstallation, and decreases the reliability thereof. Thus for example,the fire hazard is increased in that the motors are supplied from a lowvoltage high current source, with a severe risk of sparks being producedunless the equipment is properly and expertly maintained.

It is amongst the object of the present invent-ion to provide animproved installation which overcomes at least to some extent thedisadvantages aforesaid and which moreover has certain other advantages,such as for ex-- ample a decrease in the driving power required for thecarriage.

The pneumatic cleaning device according to the invention includes atleast one carriage adapted for movement over a line of textile machinerywhich carriage substantially carries only blowing and/ or suctioncleaning members communicating with pressure and or suction chambers onthe carriage, there being pressure and/or suction pipes connecting saidchambers with a stationary fan-filter unit, said pipes being of a typewhich permit movement of the carriage.

The invention will be further apparent from the following descriptionwith reference to the several figures of the accompanying drawings,which show, by way of example only, a number of installations embodyingthe invention.

Of the drawings:

FIG. 1 is a side elevation of a first embodiment for operation on asingle line of textile machinery;

FIG. 2 is a top view of the embodiment of FIG. 1;

FIG. 3 shows a top plan view of an installation incorporating severalcarriages, each similar to that of the arrangement of FIG. 1, foroperation on several lines of textile machinery;

FIG. 4 shows a side elevation of a slightly modified installation seenon FIG. 3 in a direction corresponding with that of the arrow IV;

FIG. 5 shows an elevation of the installation of FIG. 4 in the directionof the arrows V on FIG. 4;

FIG. 6 shows a variation which may be applied to any of the arrangementsof FIGS. 1-5;

FIG. 7 shows a compensating device;

Such carriage is heavy, and complicated in con- 3,317,947 Patented May9, 1967 FIG. 8 shows side elevation of an embodiment utilizing atelescopic pipe; and

FIG. 9 shows a section of telescopic connection point of the embodimentof FIG. 8.

Referring now to FIG. 1, it will be seen that double line rail track 13,13' is provided and located on supports 12 above a ring spinning machine11. A substantially rectangular box shaped carriage 14 is provided andadapted to run on the rail track 13, 13.

The interior of the carriage 14, which preferably extends projectedlaterally as at 15 and 15 beyond the rail track 13, 13' (see FIG. 2), isdivided by a number of walls into pressure and suction chambers. Forexample, as can be seen in FIG. 2, two dividing walls 16 and 16' areprovided so that one suction chamber 17 and two pressure chambers 18 and18 result.

The chamber 18 communicates with the chamber 18' by means of aconnection (not shown). Pressure hoses 19 and 19' having blowing nozzles20 and 20' depend on each side in known manner from the pressurechambers 18 and 18' respectively. Suction hoses 21 having suctionnozzles 22 depend on each side from the suction chamber 17, and thenozzles 22 terminate adjacent the floor 23.

A fixed fan-filter unit 24 is located at or adjacent one end of thespinning frame 11. The unit 24 (shown schematically) essentiallycomprises a box which is divided into a pressure chamber 26 and suctionchamber 27 by an intermediate wall 25 formed from a perforated sheet,thereby to constitute a filter.

A fan 28 is disposed in the chamber 26 and air flows through the filterwall 25 in the direction of the arrow 29. The suction chamber 27 whichis of substantially L-shaped cross-section also serves as a collectionchamber for fly or the like, and can be emptied at any time by theopening of a flap 30. Automatic or semi-automatic emptying is alsopossible if desired by provision of a suction pipe communicating withthe chamber 27 via suitable means at a central position, the closuremeans'being opened periodically or non-periodically, automatically ormanually.

The carriage 14 is connected to the fan-filter-unit 24 by two expandableairtight pipes 31 and '32 each of cou certina-type construction. Thepipe 31 connects the pressure chambers 18 and 18 of the carriage 14 withthe pressure chamber 26 of the unit 24, and the pipe 32 forms aconnection between the suction chamber 27 of the unit 24 and the suctionchamber 17 of the carriage 14.

Drive means is provided consisting of an endless cable 33 which is ledover pulleys 34 and 34', arranged adjacent to the ends of the spinningframe so that the carriage 14 can move to and fro over the whole lengthof the frame. The pulley 34' is driven by a belt 35 extending over apulley 36 Which is driven from any suitable part of the mechanism of thespinning frame.

The carriage 14 is releasably linked or coupled onto the cable 33 by apivoted or otherwise articulated member, in such manner that it is towedcontinuously to and fro by the cable or rope 33 in the direction ofarrows 37 and 37' (FIG. 2), the carriage running to and fro from one endof the spinning frame to the other as indicated by the double arrow 38.

On the to and fro movement of the carriage 14 the pipes 31 and 32 whichare constructed as coil hoses shorten or lengthen appropriately. Thepipes 31 and 32 have a diameter of 20 cm., and are tightly connected bytheir ends to the appropriate chambers.

During the whole travel of the carriage 14 in both directions, blowingair flows out of the pressure chamber 26 through the pipe 31 into thepressure chambers 18 and 18' of the carriage and thence through theblowing hoses 19 and 19' and nozzles 20 and 20' onto parts of thespinning machinery, which can be selected as desired, by adjusting thelengths of the hoses 19 and 19: and the type of nozzle 20 and 20 The airflOW lS indicated by the arrow 39. At the same time suction air, whichis drawn through the suction pipes and nozzles 21 and 22 and is ladenwith fly (fibrous dust), flows through the pipe 32 in the direction ofthe arrow 40 and enters the suction chamber 27 and thence passes asshown by arrow 29 through the filter wall into the pressure chamber 26whence it is passed out through the pipe 31 as blowing air. Thus asubstantially closed air flow results which is only modified by thedistances between the nozzles 20 and 20 on the one hand and 22 on theother. The same amount of air is always sucked up as shown by the arrowas is blown out as shown by arrow 39.

On passage through the filter wall 25 the fibrous fly settles thereon.Scrapers or the like, blowers, brushers or similar devices can beprovided at 25, to convey the fly from the filter wall 25 in thedirection indicated by arrow 41 into the lower part of the suctionchamber 27. From there the dust and fly can be removed through the flap30 or by other means as already stated.

Referring now to FIG. 3, wherein like parts are indicated by likereference numerals, a very advantageous, economical development of theinvention, is shown. Carriages 14a, 14b, 14c, are in each case arrangedon the rails 13a, 13b, 13b, 13c, 13c, on, for example, six spinningmachines set up parallel to one another and at the normal distanceapart. Each carriage has two concertina-type pipes 31a, 32a, 31b, 32b,The carriages are shown in various positions of travel. For example theposition of carriage 14b is substantially one of the end positionswherein the pipes 31b and 32b are greatly compressed. The position ofcarriage Me is substantially the other end position wherein the pipes31c and 320 are fully expanded.

It should be noted that the suction chamber 27 of the arrangement ofFIGS. 1 and 2 is here extended into a suction channel 27:: which is aslong as the total length of the group of machines. In the same way thepressure chamber 26 of the arrangement of FIGS. 1 and 2 is extended to apressure channel 26a which is as long as the channel 27a. Both channelsare closed at one end by end walls 42 and 43. At the other end a curvedconnector 44 is provided which incorporates the fan 28 and filter wall'25.

It should be mentioned that the fan 28 is preferably arranged behind thefilter 25 in the direction of flow, since the fan will forward air whichis already filtered. All the pipes 32a, 32b, 32c, of the carriages 14a,14b, 140 are attached to the suction channel 27a, and all the pipes 31a,31b, 31c are attached to the pressure channel 26a. From this it resultsthat all the pressure chambers 1-8 and 18' of all the carriages 14 arefed with air from the pressure channel 26a and that all the suctionchambers 17 of the carriages 1-4 supply fly laden air to the suctionchannel 27a.

It is convenient for the pipes 31, 32a, to run substantially at rightangles to the channels 26a and 27a. This is not however absolutelyessential and is largely determined by constructional conditions. Thus,the angle may be other than a right angle for an installation in a roomhaving inclined walls.

As shown in FIG. 4, the channel 26a can be disposed in downwardlyinclined relationship with respect to the channel 27a. In this case itis convenient to provide a rigid pipe 45 between each pipe 31 and thechannel 26a.

The suction channel 27a may for example, if desired also have a squarecross-section. As shown particularly in FIG. 5, a filter 47 in the formof an endless band is provided in place of the Wall 25, and ispositioned in front of the fan 28 seen in the direction of air flow 46.The filter 47 is adapted to revolve continuously and is scraped at asuitable position by a scraper 48 so that the fly collected thereonfalls into the suck or similar container 49 and deposits itself thereinas indicated at 50. The waste container 49 is removable for emptyingpurposes, but may be arranged for automatic emptying if desired.

A feature which favours good operation of the cleaning installation andalso the spinning process is the addition of a dampening member 51,which, seen in the direction of flow is advantageously located after orbehind the fan 28 and correctly conditions the blowing air by sprayingin liquid 52.

If desired, an air heating or air cooling device may be provided inaddition, at any suitable position, such as for example at positions 53or 53 in the pressure channel 26a. It can also be arranged that theliquid or water spray 52 and/or the heating or cooling of the air 53 isadjusted or regulated in proportion to one or more predetermined ordesired values.

Under some circumstances it is not absolutely necessary for the pipes31, 32 to run horizontally. If desired, a rise as shown in FIG. 1 frombottom right to top left may take place if the pipes 31, 32 have someflexibility or if their attachments with the carriage and fan-filterunit are pivotal.

As shown in FIG. 6, the units 24 may be suspended substantiallycentrally above the machines 11, for example, from the ceiling of thespinning room so that the pipes 31 and 32 swing to and fro in thefashion of a pendulum as the carriage travels to and fro along thetrack, lengthening and shortening correspondingly. Such an arrangementmay also be used for a group of machines as in FIG. 3. In these caseseach fan-filter unit 24 is fixed to the ceiling of the spinning room.The chambers 26 and 27 of the unit 24 are connected with concertina-typeflexible pipes 31 and 32 which leads in the manner already described.The difference here as against the embodiments previously described isthat the pipes 31 and 32 enter the box or casing of the carriage 14 fromabove. In this case too, the carriage 14 is moved to and fro, by a cable3 3, along the track rails 13 and 13.

FIG. 7 shows how any lateral force exerted on the carriage 14 by thepipes 31 and 32 in extension or compression thereof may be compensated.Thus, by way of example, a counter spring 54 may be provided which isturned to the resilient forces of the pipes 31 and 32.

FIGS. 8 and 9 show an embodiment wherein the expandable pipes are oftelescopic construction.

Thus FIG. 8, shows, by way of example, an arrangement substantially asthat of FIGS. 1 and 2, but wherein the pipes 31 and 32 are replaced bytelescopic units.

The carriage 14 which may be designed and built in the manner alreadydescribed runs on a rail 13 which is located adjacent to or above thespinning machine 11. Telescopic pipe units are arranged between thecarriage 14 and the chambers 26 and 27, of the fan-filter unit 24. Eachpipe consists of a plurality of individual telescopic pipes 80" and soon which can be pushed into and drawn out of one another, the telescopicpieces 80 on the extreme left (FIG. 8) being secured to the chambers 26and 27 and the pieces 80" at the extreme right being attached to thecarriage 14. When the carriage 14 moves to the left, the individualtelescopic pieces 80', 80" push into one another, and conveniently andadvantageously support rollers 81', 81 are arranged on the ends of sameor all of the telescopic pieces 80', 80" etc. The support rollers mayrun on the rail 13 or on a separate rail, which is present in any caseand ensures the alignment of the individual telescopic pieces 80', 80".

A connection between the telescopic pieces 80', 80" is shown by way ofexample in detail in FIG. 9 on an enlarged scale. Such connection pointsare in each case present between adjacent telescopic pieces. As shown inFIG. 9 the inter-embracing ends 82 and 83 of the telescopic pieces 80'and 80 can be formed with corrugations. The difference in diameterbetween the pieces 80' and 80" substantially corresponding with theWeight of the corrugations. The end 82 carries at a suitable position onthe periphery thereof a sliding seal ring '84, consisting of a flexible,resilient material for example a rubber of suitable shore-hardness, or aplastic. The sealring 84 is in sliding contract with the inner wall ofthe piece 80' and moreover in the uncorrugated part thereof. The end 83carries an inner seal-ring 85 which is adapted to slide on theuncorrugated part of the outer wall of the piece 80. A suificient sealis thus produced by these seal-rings 84 and '85. However other methodsof sealing may of course be used.

The twofold arrangement of rings, namely 84 and 85 also ensures a properalignment of the pieces 80" and 80".

It is advantageous to provide a very resilient sealing lip or sealinglip ring 86 which is tightly secure-d on the end of piece 80'--i.e., thetelescopic piece of larger diameter in such a way that the free end 86'of the lip ring 86 is capable of sliding on the outer wall of 80" withresilient contact.

It has become evident that with such telescopic pipes a very wide rangeof alteration in length is obtainable, ratios of 1:10 between theshortest and longest lengths being readily available. It should also beadded that, according to invention it is possible not to take the drivefor the carriage from the textile machine itself, but to provide, inplace thereof, for the direct drive of the cable pulleys 34' an electricmotor mounted on the textile machine frame or elsewhere. A similarelectric motor can be arranged in the same way for the cable pulley 36for example co-axial with the pulley 36. Such drive by electric motorwould be chosen, for example, if for particular reasons, taking thedrive from the textile machine itself is not possible or impractical.The use of expandable pipes opens up an interesting possibility, in thatthe low pressure produced within the pipe unit due to the stationarysuction (sucking from the chamber 27) can draw the carriage in thedirection of the fixed pipe end, as a result of the force whichaccording to FIG. 8, then acts on the carriage from right to left, thisforce being calculated substantially from the difference between theatmospheric air pressure and the smaller pressure ruling in the lowpressure telescopic pipe, the total pushing or drawing force being theproduct of the crosssectional surface of the pipe and the pressuredifference.

If for example two concertina-type pipes similar to those in FIG. 2 ofthe drawing wherein the one feeds pressure air and the other suction airare present, then by suitable switching of the air currents (if desiredcontrolled in a manner depended on travel of the carriage), to effectcomplete or partial closure for the attachment area of theconcertina-type pipes to the carriage, a purely pneumatic drive can beobtained for the carriage, wherein (see FIG. 2) in the one case theexcess pressures pushes the carriage to the right and in the other casethe low pressure draws the carriage to the left. The working willhowever generally be such that, for example, with a pendulating thetextile machine will only be sucked (with full closure), or sucked andblown to a lesser degree, during one direction of travel and only blown(with complete closure), or (with partial closure) blown and sucked to alesser degree during the opposite direction of travel.

The new principle of using or making available the high and lowpressures in the pipes for the movement of the carriage, can be employedwhen the pipes are of a type which have a tendency to bulge out or moveout laterally, in which case guides to keep the pipes straight should beprovided.

It will be appreciated that it is not intended to limit the invention tothe above examples only, many variations, such as might readily occur toone skilled in the art, being possible, without departing from the scopethereof.

What we claim is:

1. A travelling pneumatic cleaning installation for textile machineryand the like comprising in combination, at least one carriage adapted tobe moved over a line of the machinery to be cleaned; at least twochambers on said carriage; a fixed stationary fan-filter unit in thevicinity of said machinery, said fan-filter unit having a suction inletend and a pressure outlet end; at least two collapsible and extensiblepipe means, one of said pipe means being permanently connected at oneend thereof to said suction inlet end of said unit and at the other endthereof with one of said chambers and the other of said pipe means beingpermanently connected at one end thereof to said pressure outlet end ofsaid unit and at the other end thereof with the other of said chambers,whereby said chambers are held at a pressure different from atmosphericpressure and the pressure in one chamber different from the pressure inthe other chamber; and a number of ducts communicating at one endthereof with said chambers, respectively, and each having an other openend directed towards said machinery so as to produce between said openends of said ducts currents of air for cleaning purposes.

2. A travelling pneumatic cleaning installation according to claim 1wherein said pipe means extend substantially horizontally between saidcarriage and said fan-filter unit. 3. A travelling pneumatic cleaninginstallation according to claim 2 wherein each pipe means includes aplurality of telescopically interconnecting pieces, each of tubularsection.

4. A travelling pneumatic cleaning installation according to claim 3wherein support rollers are provided on at least some of said pieces.

5. A travelling pneumatic cleaning installation according to claim 4wherein the ends of said telescopically interconnecting pieces areformed with corrugations.

6. A travelling pneumatic cleaning installation according to claim 5wherein external and internal sealing rings are provided for each saidpiece, said rings being capable of sliding on the uncorrugated areas ofthe corresponding inner and outer surfaces of said pieces, respectively,thereby to form an airtight seal therebetween. 7. A travelling pneumaticleaning installation accord ing to claim 6 wherein an annular sealinglip is provided on one end of each said piece, said lip projectingsubstantially thereover, the free end of said lip being adapted to slideto form a resilient seal on the outer surface of the followingtelescopically interconnecting piece of smaller diameter, the lipconsisting of a resilient material. 8. A travelling pneumatic cleaninginstallation accordng to claim 3 wherein the ends of said telescopicallyinterconnecting pieces are formed with corrugations. 9. A travellingpneumatic cleaning installation according to claim 8 wherein externaland internal sealing rings are provided for each said piece, said ringsbeing capable of sliding on the uncorrugated areas of the correspondinginner and outer surface of said pieces, respectively, thereby to form anairtight seal therebetween.

10. A travelling pneumatic cleaning installation according to claim 9wherein an annular sealing lip is provided on one end of each saidpiece, said lip projecting substantially thereover, the free end of saidlip being adapted to slide to form a resilient seal on the outer surfaceof the following telescopically interconnecting piece of smallerdiameter, the lip consisting of a resilient material.

11. A travelling pneumatic cleaning installation according to claim 2wherein each said pipe means is of resilient concertina-type coiledconstruction.

12. A travelling pneumatic cleaning installation according to claim 11wherein resilient spring means are provided in connection with saidcarriage to compensate for any force placed thereon by theconcertina-type pipe means.

13. A travelling pneumatic cleaning installation according to claim 12,wherein at least one blowing pipe means and at least one suction pipemeans is provided, and including means for periodically restricting atleast to some extent the air flow in each said pipe means alternately,whereby the carriage is caused to move to and fro over the line ofmachinery under pneumatic action.

14. Travelling pneumatic cleaning installation according to claim 13 andadapted to operate on a plurality of lines of textile machinery,arranged in parallel, there being one said carriage for each said line,and including two air channels one of which is connected to said suctioninlet and the other of which is connected to said pressure outlet ofsaid fan-filter and extending from the same in a line substantially atright angles to the direction of said lines of machinery, said pipemeans connecting said carriages with said channels.

15. Travelling pneumatic cleaning installation according to claim 11 andadapted to operate on a plurality of lines of textile machinery,arranged in parallel, there being one said carriage for each said line,and including two air channels one of which is connected to said suctioninlet and other of which is connected to said pressure outlet of saidfan-filter unit and extending from the same in a line substantially atright angles to the direction of said lines of machinery, said pipemeans connecting said carriages with said channels.

16. A travelling pneumatic cleaning installation accoridng to claim 3,wherein at least one blowing pipe means and at least one suction pipemeans is provided, and including means for periodically restricting atleast to some extent the air flow in each said pipe means alternately,whereby the carriage is caused to move to and fro over the line ofmachinery under pneumatic action.

17. Travelling pneumatic cleaning installation according to claim 16,and adapted to operate on a plurality of lines of textile machinery,arranged in parallel, there being one said carriage for each said line,and including two air channels one of which is connected to said suctioninlet and the other of which is connected to said pressure outlet ofsaid fan-filter unit and extending from the same in a line substantiallyat right angles to the direction of said lines of machinery, said pipemeans connecting said carriages with said channels.

18. Travelling pneumatic cleaning installation according to claim 1wherein said fan-filter unit is disposed substantially centrally abovesaid line of machinery, said pipe means being constituted by collapsibleflexible hoses.

19. A travelling pneumatic cleaning installation according to claim 18including a towing cable in the form of an endless band mounted abovesaid line of machinery, an articulated connection between said carriageand said towing cable, and means to drive said cable, whereby saidcarriage moves to and fro over said line of machinery.

20. Travelling pneumatic cleaning installation according to claim 19wherein said towing cable is arranged to be driven from the motion ofsaid textile machinery.

21. A travelling pneumatic cleaning installation according to claim 1including a towing cable in the form of an endless band mounted abovesaid line of machinery, an articulated connection between said carriageand said towing cable, and means to drive said cable, whereby saidcarriage moves to and fro over said line of machinery.

22. A travelling pneumatic cleaning installation according to claim 21wherein said towing cable is arranged to be driven from the motion ofsaid textile machinery.

23. A travelling pneumatic cleaning installation according to claim 2,including a towing cable in the form of an endless band mounted abovesaid line of machinery, an articulated connection between said carriageand said towing cable, and means to drive said cable, whereby saidcarriage moves to and fro over said line of machinery.

24. A travelling pneumatic cleaning installation according to claim 23wherein said towing cable is arranged to be driven from the motion ofsaid textile machinery.

25. A travelling pneumatic cleaning installation according to claim 1wherein the filter of said fan-filter unit is disposed on the suctionside of said fan, and including a receptacle which may be emptied bysuitable means to collect material gathered on said filter.

26. A travelling pneumatic cleaning installation according to claim 25including means for scraping material collected on said filter anddelivering same to said receptacle.

2'7. Travelling pneumatic cleaning installation according to claim 1wherein said fan-filter unit incorporates means for conditioning the aircirculated thereby.

28. A travelling pneumatic cleaning installation according to claim 1and adapted to operate on a plurality of lines of textile machinery,arranged in parallel, there being one said carriage for each said line,and including two air channels one of which is connected to said suctioninlet and the other of which is connected to said pressure outlet ofsaid fan-filter unit and extending from the same in a line substantiallyat right angles to the direction of said lines of machinery, said pipemeans connecting said carriages with said channels.

29. Travelling pneumatic cleaning installation according to claim 2 andadapted to operate on a plurality of lines of textile machinery,arranged in parallel, there being one said carriage for each said line,and including two air channels one of which is connected to said suctioninlet and the other of which is connected to said pressure outlet ofsaid fan-filter unit and extending from the same in a line substantiallyat right angles to the direction of said lines of machinery, said pipemeans connecting said carriages with said channels.

30. Travelling pneumatic cleaning installation according to claim 1,wherein said fan-filter unit includes means for moistening the aircirculated thereby.

References Cited by the Examiner UNITED STATES PATENTS 1,630,972 5/1927Schmid 15312 2,000,112 5/1935 Wheller. 2,431,726 12/1947 Bechtler.2,830,510 4/1958 Mariani et al. 3,003,177 10/1961 Hijiya 153 12.13,018,503 1/1962 Hijiya et al. l5-352 3,045,274 7/1962 Sohler 15352 XFOREIGN PATENTS 3,l13 2/1909 Great Britain. 907,545 10/1962 GreatBritain. 635,214 3/1962 Italy.

ROBERT W. MICHELL, Primary Examiner.

1. A TRAVELLING PNEUMATIC CLEANING INSTALLATION FOR TEXTILE MACHINERY AND THE LIKE COMPRISING IN COMBINATION, AT LEAST ONE CARRIAGE ADAPTED TO BE MOVED OVER A LINE OF THE MACHINERY TO BE CLEANED; AT LEAST TWO CHAMBERS ON SAID CARRIAGE; A FIXED STATIONARY FAN-FILTER UNIT IN THE VICINITY OF SAID MACHINERY, SAID FAN-FILTER UNIT HAVING A SUCTION INLET END AND A PRESSURE OUTLET END; AT LEAST TWO COLLAPSIBLE AND EXTENSIBLE PIPE MEANS, ONE OF SAID PIPE MEANS BEING PERMANENTLY CONNECTED AT ONE END THEREOF TO SAID SUCTION INLET END OF SAID UNIT AND AT THE OTHER END THEREOF WITH ONE OF SAID CHAMBERS AND THE OTHER OF SAID PIPE MEANS BEING PERMANENTLY CONNECTED AT ONE END THEREOF TO SAID PRESSURE OUTLET END OF SAID UNIT AND AT THE OTHER END THEREOF WITH THE OTHER OF SAID CHAMBERS, WHEREBY SAID CHAMBERS ARE HELD AT A PRESSURE IN ONE CHAMBER ATMOSPHERIC PRESSURE AND THE PRESSURE IN ONE CHAMBER DIFFERENT FROM THE PRESSURE IN THE OTHER CHAMBER, AND A NUMBER OF DUCTS COMMUNICATING AT ONE END THEREOF WITH SAID CHAMBERS, RESPECTIVELY, AND EACH HAVING AN OTHER OPEN END DIRECTED TOWARDS SAID MACHINERY SO AS TO PRODUCE BETWEEN SAID OPEN ENDS OF SAID DUCTS CURRENTS OF AIR FOR CLEANING PURPOSES. 